Forced circulation

ABSTRACT

THIS INVENTION INVOLVES A SYSTEM FOR PROCESSING LIQUID WASTERS CONTAINING DISSOLVED SOLIDS WHICH RESULT FROM THE OPERATION OF A NUCLEAR STEAM SUPPLY SYSTEM. THE PROCESSING SEQUENCE IS TO FIRST COLLECT THE LIQUID WASTES IN HOLD-UP TANK (12 AND 14). WHEN SUFFICIENT VOLUME IS COLLECTED, THE LIQUID WASTE IS PUMPED THROUGH A FILTER (28) TO THE FIRST STAGE OF A DUAL EVAPORATION PROCESS. THIS FIRST STAGE, THE PRE-CONCENTRATOR, CONSISTS OF A FORCED-CIRCULATION EVAPORTOR (30) WITH A VARY HIGH BOTTOMS-TO-DISTILLATE DECONTAMINATION FACTOR. THE CONCENTRATE FROM THIS UNIT IS FED TO ONE OF TWO THIN FILM EVAPORATORS (32) WHICH FURTHER CONCENTRATES THE LIQUID WASTE AND DISCHARGES SOLIDS TO LOW MOISTURE CONTENT. THE SOLIDS ARE THAN DRUMMED AND SHIPPED OFF-SITE FOR DISPOSAL. THE DISTILLATE PRODUCED FROM THE THIN FILM EVAPORATOR IS RECYCLED BACK TO THE ORIGINAL COLLECTION TANKS IN ORDER TO MAINTAIN A VARY HEIGH OVERALL DECONTAMINATION FACTOR FOR THE DRILLATE.

DEFENSIVE PUBLICATIGN UNITED STATES PATENT AND TRADEMARK OFFICEPublished at the request of the applicant or owner in accordance withthe Notice of Dec. 1631969, 869 0.G. 687. The abstracts of DefensivePublication applications are identified by distinctly numbered seriesand are arranged chronologically. The heading of each abstract indicatesthe number of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent and Trademark Oflice makes noassertion as to the novelty of the disclosed subject matter.

PUBLISHED OCTOBER 7, 1975 T932005 SPENT REGENERANT PROCESSING SYSTEMDavid Norman Enegess, East Windsor, and Philli Daniel Paquette, Enfield,Conn., and Hashem N. Elsherif, Cleveland, Ohio, assignors to CombustionEngineering, Inc., Windsor, Conn.

Filed Mar. 20, 1974, Ser. No. 452,857 "Int. Cl. C09k 3/00 US. Cl.252-301.1 W 1 Sheet Drawing. 9 Pages Specification FORCED CIRCULATIONPRE-EVAPORATOR "rum FILM i This invention involves a system forprocessing liquid wastes containing dissolved solids which result fromthe operation of a nuclear steam supply system. The processing sequenceis to first collect the liquid wastes in hold-up tanks (12 and 14). Whensufficient volume is collected, the liquid waste is pumped through afilter (28) to the first stage of a dual evaporation process. This firststage, the pre-concentrator, consists of a forced-circulation evaporator(30) with a very high bottoms-to-distillate decontamination factor. Theconcentrate from this unit is fed to one of two thin film evaporators(32) 'WhiCh further concentrates the liquid waste and discharges solidsof low moisture content. The solids are then drummed and shippedelf-site for disposal. The distillate produced from the thin filmevaporator is recycled back to the original collection tanks in order tomaintain a very high overall decontamination factor for the distillate.

